Thus, I assume you own some Epia. Well the mplayer was compiled for use with MMX and SSE codes as you can see in the message.The Epias do have MMX (and even 3dnow) but not SSE (as you can see in the message as well).

The mplayer.dsl is compiled for pentium only (BAD).So you epia-cpu hits some SSE-instruction and bails out with"illegal instruction"I have the same prob with my Epia 5000 and Im pretty sure thats the problem.Quite several mydsl-packages have that very same problem.You'd have to recompile mplayer for the epia-board on your own.If its a later version there are even patches around to use the CLE266-mpeg2-decoder. This will speed up your 800mhz alot in dvd-playback.